You will have two significant problems making an argument for adverse possession: First, the time for adverse possession in PA is 21 years, and your uncle has only been in possession for 19 years. However, even if he would manage to stay on the property for another two years, he would not likely succeed in obtaining the property under adverse possession. This is because his initial possession was undertaken with the permission of your great uncle. Adverse possession must be "hostile," that is, without permission.
On the facts you have given, other than coming to an agreement with your great-uncle (or his brother via POA), I don't believe your uncle could "claim/take the land."
Is your great uncle still alive? If not, the will (or a deed in joint tenancy) controls the disposition of the property, not a conversation from two years ago. If he is alive, is he physically and mentally capable of making decisions about the property? If so, your uncle would want to speak with him directly.
Of course, I don't know all the facts of this case. I recommend that you speak with an attorney in your area for more decisive guidance.
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Marshall D. Chriswell is a civil practitioner with offices in Indiana and Clearfield Counties. Mr. Chriswell's practice emphasizes Wills & Estate Planning, Probate, Real Estate, and general civil disputes.
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Attorney Chriswell is correct. You may not like his answer, but it is correct. Let me add one more thing, when you sat down with your great uncle to ask what would happen if he died, you probably confirmed the lack of hostility. Hostility is an element of adverse possession. I do not mean hostility in the sense of two people ready to get a divorce. I mean discussing the matter established that one person does not claim ownership of the property in a manner hostile to the ownership claims of the other. Search this site for my guides on adverse possession for more information. They are excerpts from a book on the topic I wrote for Continuing Legal Education courses.
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